Method system of studying sequence stratigraphic framework of big sagged lacustrine basin: an example in Yanchang Formation of Mesozoic, Ordos Basin
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摘要: 摘 要 大型坳陷湖盆层序地层学研究有很大进展，但鄂尔多斯大型湖盆层序地层研究进展缓慢，主要原因是黄土塬地震资料品质差，钻井资料多解性强，横向等时对比困难，尚未找到合适的研究方法体系。本文通过三年攻关研究，总结出适于这种湖盆层序地层格架建立的方法体系，笔者称之为“六定”方法体系：“露头剖面定标准、小波变换定级次、湖平面变化定旋回、测井曲线定样式、地震解释定格架、三者结合定方案”。通过“六定”方法体系的系统应用，建立了可以在全盆地范围内进行地层划分与对比的三级层序地层格架。Abstract: Abstract The study about sequence stratigraphy in big sagged lacustrine basin have made a quiet great progress, but the study about sequence stratigraphy in Ordos big sagged lacustrine basin have made less progress. The reasons as follow: the trait of seismic data on Loess Plateau is bad; the logging data may be interpreted variedly; contrast in isochronous is difficult; and right method system has not been found. In this paper, authors put forward a new method system of studying sequence stratigraphic framework of big sagged lacustrine basin which include six parts: establishing standard from outcrop profiles, confirming grade of sequence from wavelet analysis, ascertaining sequence cycles from lake level changes, affirming mode from borehole logs, notarizing framework from seismic interpretation, and proposing scheme from the integration of outcrop profiles, borehole logs and seismic interpreted profiles. This method system has been applied to the projects about petroleum prospecting of Ordos Mesozoic Basin. Finally, we have established the sequence stratigraphic framework which adapts to divide and contrast stratigraphy in Ordos Mesozoic basin.
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